ir3/sched: Make collects count against tex/sfu limits

ir3/sched: Make collects count against tex/sfu limits

In a scenario where there are a lot of texture fetches with constant
coordinates, this prevents the scheduler from scheduling all the setup
instructions after the first group of textures has been scheduled
because they are the only non-syncing thing and scheduling them didn't
decrease tex_delay. Collects with immed/const sources will turn into
moves of those sources, so we should treat them the same.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9842>